Responses of hydrolytic enzyme activities in saline-alkaline soil to mixed inorganic and organic nitrogen addition.
Responses of hydrolytic enzyme activities in saline-alkaline soil to mixed inorganic and organic nitrogen addition.
复制标题
盐碱土水解酶活性对无机有机氮混合添加的响应
DOI：
10.1038/s41598-018-22813-9
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发表时间：
2018-03-14
影响因子：
4.6
通讯作者：
Sun W
中科院分区：
文献类型：
--
作者：
Shi B;Zhang J;Wang C;Ma J;Sun W
利用单一形态氮素操纵氮素沉积对土壤酶活性的影响已被广泛研究。然而，不同的氮素类型(有机和无机)对土壤水解酶活性的影响研究较少。我们在盐碱土壤上进行了60 天的培养实验。目的是探索在不同无机与有机氮比例下微生物生物量和酶活性对混合氮添加的响应。试验设计为全析因试验，两个氮素添加比例(10 g N m−2和20 g N m−2)和四个氮素添加比例(无机N：有机N = 10：0，7：3，3：7，1：9)。结果表明，氮素的添加促进了参与C、N、P循环的酶活性。在大多数情况下，混合施氮量处理的酶活性高于单一无机施氮量处理。无机氮与有机氮的比例与氮素加入量存在交互作用，从而影响酶的活性。我们的结果表明，在评价大气氮沉降对土壤微生物酶活性和生态系统结构与功能的影响时，应使用各种无机与有机氮比例不同的氮肥。
The effects of manipulating nitrogen (N) deposition, with the use of a single form of N, on soil enzyme activities have been extensively studied. However, the impacts varying the N type (organic vs. inorganic) on soil hydrolytic enzyme activities have been less studied. We performed a 60 day incubation experiment using saline-alkaline soil. The objectives were to explore how the microbial biomass and enzyme activities respond to a mixed N addition at different inorganic to organic N ratios. The experimental design was full factorial, with two rates of N addition (10 g N m−2 and 20 g N m−2) and four ratios of N addition (inorganic N:organic N = 10:0, 7:3, 3:7, 1:9). The results showed that N addition stimulated enzyme activities involved in C, N and P cycling. Enzyme activities under mixed N addition increased compared to those under single inorganic N addition in most cases. The inorganic to organic N ratios interacted with the N addition rate to affect the enzyme activities. Our results suggest that various N fertilizers, which have different inorganic to organic N ratios, should be applied when evaluating the effects of atmospheric N deposition on the soil microbial enzyme activities and ecosystem structure and function.
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